目前存在官方bug，BottomNavigationView点击切换时，fragment重复执行onCreateView
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| <?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/bottom_nav_view"
android:layout_width="match_parent"
android:layout_height="60dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="@menu/bottom_menu"
android:orientation="horizontal"
android:background="?android:attr/windowBackground"
app:itemIconTint="@drawable/selector_bottom_navigation"
app:itemTextColor="@drawable/selector_bottom_navigation"/>
<androidx.fragment.app.FragmentContainerView
android:id="@+id/my_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="60dp"
app:defaultNavHost="true"
app:navGraph="@navigation/navigation" />
</androidx.constraintlayout.widget.ConstraintLayout>
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| <?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/f1"
android:icon="@drawable/icon_1"
android:contentDescription="home"
android:title="home" />
<item
android:id="@+id/f2"
android:icon="@drawable/icon_2"
android:contentDescription="project"
android:title="project" />
<item
android:id="@+id/f3"
android:icon="@drawable/icon_3"
android:contentDescription="personal"
android:title="personal" />
</menu>
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| <?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/navigation.xml"
app:startDestination="@id/f1">
<fragment
android:id="@+id/f1"
android:name="com.stew.kotlinjetpack.navigation.Test1Fragment"
tools:layout="@layout/fragment_test1"/>
<fragment
android:id="@+id/f2"
android:name="com.stew.kotlinjetpack.navigation.Test2Fragment"
tools:layout="@layout/fragment_test2"/>
<fragment
android:id="@+id/f3"
android:name="com.stew.kotlinjetpack.navigation.Test3Fragment"
tools:layout="@layout/fragment_test3"/>
</navigation>
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| val f = supportFragmentManager.findFragmentById(R.id.my_fragment) as NavHostFragment
findViewById<BottomNavigationView>(R.id.bottom_nav_view).setupWithNavController(f.navController)
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